Empirical Project 4 Working in Excel

Excel-specific learning objectives

In addition to the learning objectives for this project, in this section you will learn how to generate new variables using cell formulas.

Part 4.1 GDP and its components as a measure of material wellbeing

The GDP data we will look at is from the United Nations’ National Accounts Main Aggregates Database, which contains estimates of total GDP and its components for all countries over the period 1970–Present. We will look at how GDP and its components have changed over time, and investigate the usefulness of GDP per capita as a measure of wellbeing.

To answer the questions below, download the data and make sure you understand how the measure of total GDP is constructed.

  1. You can see from the tab ‘Download-GDPconstant-USD-countr’ that some countries have missing data for some of the years. The missing data could be due to political reasons (for example, countries formed after 1970) or data availability issues.
Country Number of years of GDP data
   
   
   
   

Number of years of GDP data available for each country.

Figure 4.1 Number of years of GDP data available for each country.

Excel walk-through 4.1 Making a frequency table

Figure 4.2 How to make a frequency table.

The data

This is what the data looks like. Column B has country names, Column C has the different components of GDP, and Column D onwards has the values of the GDP components for a particular year.

Figure 4.2a This is what the data looks like. Column B has country names, Column C has the different components of GDP, and Column D onwards has the values of the GDP components for a particular year.

Count the years of data available in each row

We will first count the number of years of data available using the COUNTA function, which tells us how many cells in a given selection are non-empty (i.e. have data). We will store this information in Column AY, as shown.

Figure 4.2b We will first count the number of years of data available using the COUNTA function, which tells us how many cells in a given selection are non-empty (i.e. have data). We will store this information in Column AY, as shown.

Filter the data

We only want to know how many years of ‘Final consumption expenditure’ are available for each country, so we need to filter the rest of the data.

Figure 4.2c We only want to know how many years of ‘Final consumption expenditure’ are available for each country, so we need to filter the rest of the data.

Filter the data

After step 7, the data will be filtered so there is only one number for each country. Your table is ready to copy and paste into a new tab.

Figure 4.2d After step 7, the data will be filtered so there is only one number for each country. Your table is ready to copy and paste into a new tab.

Paste the data in a new tab

The table will now look like Figure 4.1. The final step is to count the number of countries with missing data.

Figure 4.2e The table will now look like Figure 4.1. The final step is to count the number of countries with missing data.

Count the number of countries with missing data

To count the number of countries with missing data, use the COUNTIF function. Excel will count the number of cells in a given selection that meet the specified criteria.

Figure 4.2f To count the number of countries with missing data, use the COUNTIF function. Excel will count the number of cells in a given selection that meet the specified criteria.

If you add up the data on the right-hand side of this equation, you may find that it does not add up to the reported GDP value. The UN notes this discrepancy in Section J, item 17 of the ‘Methodology for the national accounts’: ‘The sums of com­ponents in the tables may not necessarily add up to totals shown because of rounding’.

There are three different ways in which countries calculate GDP for their national accounts, but we will focus on the expenditure approach, which calculates Gross Domestic Product (GDP) as:

Final consumption expenditure is the sum of Household consumption expenditure (including Non-profit institutions serving households), and General government final consumption expenditure.

  1. Rather than looking at Exports and Imports separately, we usually look at the difference between them (Exports minus Imports), also known as Net Exports. Choose three countries that have GDP data over the entire period (1970 to the latest year available). For each country, create a new row that shows the values of Net Exports in each year. Make sure to give each row an appropriate label.

Now, we will create charts to show the GDP components in order to look for general patterns over time and make comparisons between countries.

  1. Evaluate the value of the components over time, for two countries of your choice.

Excel walk-through 4.2 Adding data labels to a chart

Figure 4.3 How to add data labels to a chart.

The data

This example uses GDP data from Afghanistan. The data has been filtered so that only the components of interest are visible.

Figure 4.3a This example uses GDP data from Afghanistan. The data has been filtered so that only the components of interest are visible.

Draw a line chart

After step 3, the line chart will look like the one shown above.

Figure 4.3b After step 3, the line chart will look like the one shown above.

Add a data label to a particular point in the chart

Instead of adding data labels to every point in the chart, you can choose to label specific points only. After step 4, only the selected data point will be labelled.

Figure 4.3c Instead of adding data labels to every point in the chart, you can choose to label specific points only. After step 4, only the selected data point will be labelled.

Change the text in the label and reposition the label

By default, Excel will label data points with the horizontal axis and vertical axis values. You can change the label to text by clicking and typing into the box.

Figure 4.3d By default, Excel will label data points with the horizontal axis and vertical axis values. You can change the label to text by clicking and typing into the box.

  1. Another way to visualize the GDP data is to look at each component as a proportion of total GDP. Use the same countries that you chose for Question 3.
time series data
A time series is a set of time-ordered observations of a variable taken at successive, in most cases regular, periods or points of time. Example: The population of a particular country in the years 1990, 1991, 1992, … , 2015 is time series data.
cross-sectional data
Data that is collected from participants at one point in time or within a relatively short time frame. In contrast, time series data refers to data collected by following an individual (or firm, country, etc.) over a course of time. Example: Data on degree courses taken by all the students in a particular university in 2016 is considered cross-sectional data. In contrast, data on degree courses taken by all students in a particular university from 1990 to 2016 is considered time series data.

So far, we have done comparisons of time series data, which is a collection of values for the same variables and subjects, taken at different points in time (for example, GDP of a particular country, measured each year). We will now make some charts using cross-sectional data, which is a collection of values for the same variables for different subjects, usually taken at the same time.

  1. Choose three developed countries, three countries in economic transition, and three developing countries (for a list of these countries, see Tables A-C in the UN country classification document).
  1. GDP per capita is often used to indicate material wellbeing instead of GDP, because it accounts for differences in population across countries. Refer to the following articles to help you to answer the questions:

Part 4.2 The HDI as a measure of wellbeing

In Part 4.1 we looked at GDP per capita as a measure of material wellbeing. While income has a major influence on wellbeing because it allows us to buy the goods and services we need or enjoy, it is not the only determinant of wellbeing. Many aspects of our wellbeing cannot be bought, for example, good health or having more time to spend with friends and family.

We are now going to look at the Human Development Index (HDI), a measure of wellbeing that includes non-material aspects, and make comparisons with GDP per capita (a measure of material wellbeing). GDP per capita is a simple index calculated as the sum of its elements, whereas the HDI is more complex. Instead of using different types of expenditure or output to measure wellbeing or living standards, the HDI consists of three dimensions associated with wellbeing:

We will first learn about how the HDI is constructed, and then use this method to construct indices of wellbeing according to criteria of our choice.

The HDI data we will look at is from the Human Development Report 2016 by the United Nations Development Programme (UNDP). To answer the questions below, download the data and technical notes from the report:

  1. Refer to the technical notes and Table 1 in the spreadsheet. For each indicator, explain whether you think it is a good measure of the dimension, and suggest alternative indicators, if any. (For example, is GNI per capita a good measure of the dimension ‘a decent standard of living’?)
  1. Figure 4.4 shows the minimum and maximum values for each indicator. Discuss whether you think these are reasonable. (You can read the justification for these values in the technical notes.)
Dimension Indicator Minimum Maximum
Health Life expectancy (years) 20 85
Education Expected years of schooling (years) 0 18
Mean years of schooling (years) 0 15
Standard of living Gross national income per capita (2011 PPP $) 100 75,000

Maximum and minimum values for each indicator in the HDI.

Figure 4.4 Maximum and minimum values for each indicator in the HDI.

United Nations Development Programme. 2016. ‘Technical notes’ in Human Development Report 2016: p. 2.

We are now going to apply the method for constructing the HDI, by recalculating the HDI from its indicators. We will use the formula below, and the minimum and maximum values in the table in Figure 4.4. These are taken from page 2 of the technical notes, which you can refer to for additional details.

The HDI indicators are measured in different units and have different ranges, so in order to put them together into a meaningful index, we need to normalize the indicators using the following formula:

Doing so will give a value in between 0 and 1 (inclusive), which will allow comparison between different indicators.

  1. Refer to Figure 4.4 and calculate the dimension index for each of the dimensions in a separate column in the Table 1 tab of the spreadsheet:

Find out more The natural log: What it means, and how to calculate it in Excel

The natural log turns a linear variable into a concave variable, as shown in Figure 4.5. For any value of income on the horizontal axis, the natural log of that value on the vertical axis is smaller. At first, the difference between income and log income is not that big (for example, an income of 2 corresponds to a natural log of 0.7), but the difference becomes bigger as we move rightwards along the horizontal axis (for example, when income is 100,000, the natural log is only 11.5).

Comparing income with the natural logarithm of income.

Figure 4.5 Comparing income with the natural logarithm of income.

The reason why natural logs are useful in economics is because they can represent variables that have diminishing marginal returns: an additional unit of input results in a smaller increase in the total output than did the previous unit. (If you have studied production functions, then the shape of the natural log function might look familiar.)

When applied to the concept of wellbeing, the ‘input’ is income, and the ‘output’ is material wellbeing. It makes intuitive sense that a $100 increase in per capita income will have a much greater effect on wellbeing for a poor country compared to a rich country. Using the natural log of income incorporates this notion into the index we create. Conversely, the notion of diminishing marginal returns is not captured by GDP per capita, which uses actual income and not its natural log. Doing so makes the assumption that a $100 increase in per capita income has the same effect on wellbeing for rich and poor countries.

Excel’s LN function calculates the natural log of a value for you. Simply type ‘=LN(’, then the number you would like to take the natural log of, then ‘)’ and press Enter. If you have a scientific calculator, you can check that the calculation is correct by using the ‘ln’ or ‘log’ key.

Now that you know about the natural log, you might want to go back to Question 2(c) in Part 4.1, and create a new chart using the natural log scale. Using the natural log scale, you will be able to ‘read off’ the relative growth rates from the slopes of the different series you have plotted. For example, a 0.01 change in the vertical axis value corresponds to a 1% change in that variable. This will allow you to compare the growth rates of the different components of GDP.

geometric mean
A summary measure calculated by multiplying N numbers together and then taking the Nth root of this product. The geometric mean is useful when the items being averaged have different scoring indices or scales, because it is not sensitive to these differences, unlike the arithmetic mean. For example, if education ranged from 0 to 20 years and life expectancy ranged from 0 to 85 years, life expectancy would have a bigger influence on the HDI than education if we used the arithmetic mean rather than the geometric mean. Conversely, the geometric mean treats each criteria equally. Example: Suppose we use life expectancy and mean years of schooling to construct an index of wellbeing. Country A has life expectancy of 40 years and a mean of 6 years of schooling. If we used the arithmetic mean to make an index, we would get (40 + 6)/2 = 23. If we used the geometric mean, we would get (40 × 6)1/2 = 15.5. Now suppose life expectancy doubled to 80 years. The arithmetic mean would be (80 + 6)/2 = 43, and the geometric mean would be (80 × 6)1/2 = 21.9. If, instead, mean years of schooling doubled to 12 years, the arithmetic mean would be (40 + 12)/2 = 26, and the geometric mean would be (40 × 12)1/2 = 21.9. This example shows that the arithmetic mean can be ‘unfair’ because proportional changes in one variable (life expectancy) have a larger influence over the index than changes in the other variable (years of schooling). The geometric mean gives each variable the same influence over the value of the index, so doubling the value of one variable would have the same effect on the index as doubling the value of another variable.

Now, we can combine these dimensional indices to give the HDI. The HDI is the geometric mean of the three dimension indices (IHealth = Life expectancy index, IEducation = Education index, and IIncome = GNI index):

  1. Use the formula above and the data in Table 1 of the spreadsheet to calculate the HDI for all the countries excluding those in the ‘Other countries or territories’ category. You should get the same values as those in Column C, rounded to 3 decimal places.

Excel walk-through 4.3 Calculating the HDI

Figure 4.6 How to calculate the HDI.

The data

The HDI data looks like this. The HDI value for each country is in Column C, and its four components are in Columns E, G, I, and K.

Figure 4.6a The HDI data looks like this. The HDI value for each country is in Column C, and its four components are in Columns E, G, I, and K.

Calculate dimension indices of each component.

First, we will calculate the dimension indices of each component of the HDI, and store this information in Columns Q to T, as shown above.

Figure 4.6b First, we will calculate the dimension indices of each component of the HDI, and store this information in Columns Q to T, as shown above.

Calculate dimension indices of each component

After step 4, you will have dimension indices for each component. Make sure to use the LN function to calculate the dimension index for income.

Figure 4.6c After step 4, you will have dimension indices for each component. Make sure to use the LN function to calculate the dimension index for income.

Calculate the index value for education

To calculate the HDI, we need the index value for education, which we get by taking the average of the two dimension indices for schooling.

Figure 4.6d To calculate the HDI, we need the index value for education, which we get by taking the average of the two dimension indices for schooling.

Calculate the HDI

After step 6, you will have the correct HDI value for most countries. For the other countries, we need to recalculate the dimension index for expected years of schooling, in order to get the correct value.

Figure 4.6e After step 6, you will have the correct HDI value for most countries. For the other countries, we need to recalculate the dimension index for expected years of schooling, in order to get the correct value.

Amend the formula for expected years of schooling to give the correct HDI values

The problem with some countries is that expected years of schooling is greater than the value chosen as the maximum (18). In these cases, replacing the dimension index with 1 solves the problem.

Figure 4.6f The problem with some countries is that expected years of schooling is greater than the value chosen as the maximum (18). In these cases, replacing the dimension index with 1 solves the problem.

Round the calculated values to 3 decimal places

To make the HDI values easier to read, we will round them to 3 decimal places, as was done in Column C.

Figure 4.6g To make the HDI values easier to read, we will round them to 3 decimal places, as was done in Column C.

Round the calculated values to 3 decimal places

After step 10, your HDI values should look the same as those in Column C.

Figure 4.6h After step 10, your HDI values should look the same as those in Column C.

The HDI is one way to measure wellbeing, but you may think that it does not use the most appropriate measures for the non-material aspects of wellbeing (health and education).

Now we will use the same method to create our own index of non-material wellbeing (an ‘alternative HDI’), using different indicators. Tables 8, 9, 11, 12, and 13 in the spreadsheet contain the indicators that you can use to measure health and education instead of those used in Questions 2 to 4.

  1. Create an alternative index of wellbeing:

Excel walk-through 4.4 Ranking data

Follow the walk-through in the CORE video, or in Figure 4.7, to find out how to rank data in Excel.

Figure 4.7 How to use Excel’s RANK function.

The data

In this example, the created index is in Column Q (titled ‘Own index’) and was calculated as the dimension index of Expected years of schooling.

Figure 4.7a In this example, the created index is in Column Q (titled ‘Own index’) and was calculated as the dimension index of Expected years of schooling.

Rank the index values from largest to smallest

We will rank the values of our own index from largest to smallest, and store this information in Column R.

Figure 4.7b We will rank the values of our own index from largest to smallest, and store this information in Column R.

Compare the rankings to the HDI index rankings.

Figure 4.7c

  1. Compare your alternative index to the HDI:
Classification HDI
Very high human development 0.800 and above
High human development 0.700–0.799
Medium human development 0.550–0.699
Low human development Below 0.550

Classification of countries according to their HDI value.

Figure 4.8 Classification of countries according to their HDI value.

United Nations Development Programme. 2016. ‘Technical notes’ in Human Development Report 2016: p.3.

We will now investigate whether HDI and GDP per capita give similar information about overall wellbeing, by comparing a country’s rank in both measures. Refer to the data in Table 10 of the spreadsheet. Column E contains the GDP per capita in 2015, measured in 2011 constant prices in US dollars. To answer Question 7, first copy and paste this data into a new column in the Table 1 tab of the spreadsheet, making sure to match the data to the correct country.

  1. Evaluate GDP per capita and the HDI as measures of overall wellbeing:
HDI
Low High
GDP Low
High

Classification of countries according to their HDI and GDP values.

Figure 4.9 Classification of countries according to their HDI and GDP values.

  1. The HDI is one way to measure wellbeing, but there are many other ways to measure wellbeing.